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D( x )
3*x+4 = 0
3*x+4 = 0
3*x+4 = 0
3*x+4 = 0 // - 4
3*x = -4 // : 3
x = -4/3
x in (-oo:-4/3) U (-4/3:+oo)
(4-(2*x))/(3*x+4) = 0
(4-2*x)/(3*x+4) = 0
4-2*x = 0 // - 4
-2*x = -4 // : -2
x = -4/(-2)
x = 2
x = 2
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